期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 61, 期 7, 页码 831-840出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2006.04.008
关键词
flow injection; chemical vapor generation atomic fluorescence spectrometry; inorganic mercury; methylmercury; knotted reactor; preconcentration
类别
A novel non-chromatographic approach for direct speciation of mercury, based on the selective retention inorganic mercury and methylmercury on the inner wall of a knotted reactor by using ammonium diethyl dithiophosphate and dithizone as complexing agents respectively, was developed for flow injection on-line sorption preconcentration coupled with chemical vapor generation non-dispersive atomic fluorescence spectrometry. With the sample pH kept at 2.0, the preconcentration of inorganic mercury on the inner walls of the knotted reactor was carried out based on the exclusive retention of Hg-DDP complex in the presence of methylmercury via on-line merging the sample solution with ammonium diethyl dithiophosphate solution, and selective preconcentration methylmercury was achieved with dithizone instead of ammonium diethyl dithiophosphate. A 15% (v/v) HCl was introduced to elute the retained mercury species and merge with KBH4 solution for atomic fluorescence spectrometry detection. Under the optimal experimental conditions, the sample throughputs of inorganic mercury and methylmercury were 30 and 20 h(-1) with the enhancement factors of 13 and 24. The detection limits were found to be 3.6 ng l(-1) for Hg2+ and 2.0 ng l(-1) for CH3Hg+. The precisions (RSD) for the 11 replicate measurements of each 0.2 mu g l(-1) of Hg2+ and CH3Hg+ were 2.2% and 2.8%, respectively. The developed method was validated by the analysis of certified reference materials (simulated natural water, rice flour and pork) and by recovery measurements on spiked samples, and was applied to the determination of inorganic mercury and methylmercury in biological and environmental water samples. (c) 2006 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据